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Título

Vasotocinergic and isotocinergic systems: their roles in osmotic stress in the gilthead sea bream (Sparus aurata)

Autor Martos-Sitcha, Juan Antonio ; Gozdowska, M.; Kulczykowska, Ewa; Martínez-Rodríguez, Gonzalo ; Mancera, Juan Miguel
Fecha de publicación sep-2011
Citación 8º Congreso de la Asociación Ibérica de Endocrinología Comparada (2011)
ResumenA role in osmotic stress has been proposed for vasotocinergic and isotocincrgic systems in different fish species. We assessed, in a time course response study (day 0, 12 hours, 1, 3, 7 and 14 days), the changes in hypothalamic pro-Vasotocin and pro-Isotocin mRNA expression, as well as in pituitary arginine vasotocin (AVT) and isotocin (IT) content in gilthead sea bream (S. aurata) submitted to acute transfer from 40 ¿ to different environmental salinities: 40 ¿, low salinity water (LSW, 5 ¿) and high saline water (HSW, 55 ¿). Two osmoregulatory periods could be distinguished consistent with plasma osmolality and metabolic parameters variations: i) an adaptative period during the first days of acclimation (12 hours-3 days) with important changes in these parameters, and ii) a chronic regulatory period (after 3 days of transfer) where osmotic parameters reached homeostasis. Clear modifications were distinguished under hiper- and hypoosmotic environments in hypothalamic pro-vasotocin and pro-isotocin mRNA expression as well as in AVT and IT pituitary storage. Pattern of change in pro vasotocin expression, but not of pro-isotocin mRNA, correlated with plasma cortisol variations, indicating a possible interaction between vasotocinergic and stress systems. Pituitary storage of both hormones presented a faster increase in LSW transferred specimens respect to HSW transferred. Our results suggest a role of both vasotocinergic and isotocinergic systems in the osmoregulatory response of gilthead sea bream (S. aurata) to changes in environmental salinities. Acknowledgements: Study funded by project AGL2010-14876 from MICINN. JAM-S is supported by a predoctoral fellowship (FPU, Reference AP2008-01194) from Ministry of Education (Spain).
Descripción Trabajo presentado en el 8º Congreso de la Asociación Ibérica de Endocrinología Comparada (AIEC), celebrado en Madrid del 5 al 7 de septiembre de 2011.
URI http://hdl.handle.net/10261/110494
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